border-radius
1rem radii for all four corners
1rem radii for top-left and bottom-right corners,
2rem radii for top-right and bottom-left corners
1rem and 0.5rem radii for top-left and bottom-right corners,
2rem and 0.5rem radii for top-right and bttom left corners
1rem and 0.5rem radii for top-left corner,
2rem and 1.5rem radii for top-right and bottom-left corners,
3rem and 0.5rem radii for bottom-right corner;
1rem and 0.5rem radii for top-left corner,
2rem and 1.5rem radii for top-right corner,
3rem and 2.5rem radii for bottom-right corner,
4rem and 3.5rem radii for bottom-left corner;